Girls Aloud star Nadine Coyle pregnant with her first baby

The singer revealed she is expecting a baby by sharing a picture with her followers on her Instagram page announcing the news, but has yet to confirm the father's identity.

Swell news: Nadine will be the first of her band mates to become a mother
The sepia-tinged snapshot shows an excited looking Nadine with the words, "I am having a baby. Xx', emblazoned across the image.

The Northern Irish star will become the first Girls Aloud singer to become a mother.

The band - with Cheryl Cole, Kimberley Walsh, Sarah Harding and Nicola Roberts - recently reunited for a 10-year celebration tour but split after their final concert in March.

Former bandmate Cole tweeted her congratulations, writing: "I just woke up to the news that there is to be a baby aloud!! This is so crazy. But Amazing!!

"Congratulations @nadinecoylenow. Can't believe you're going to be a mummy!!!!!!!!!!!"

The Northern Irish singer is thought to have got back together with her partner of three years, American footballer Jason Bell, after they were pictured together in March this year.

Girls together: Cheryl Cole, Nicola Roberts, Nadine Coyle, Kimberley Walsh and Sarah Harding last year
The couple announced their year-long engagement was over in June 2011, but rumours of a reconciliation began to circulate when Jason flew to the UK to watch her perform with Girls Aloud at London's O2 arena earlier this year.

Nadine, 28, previously dated Dallas actor Jesse Metcalfe and had a brief romance with club promoter Waz Ashayer last year.

Coyle's legions of excited fans also rushed to congratulate her. One posted: "OMG! Actually crying! You will be an amazing mummy, I don't mind babysitting for you at all love you so much (sic)"

Another wrote: "Congratulations Nadine! You're going to be an absolutely amazing Mum (sic)"